It may be nestling in the barn (5)

I believe the answer is:

owlet

I'm a little stuck... Click here to teach me more about this clue!

'nestling in the barn' is the definition.
'owlet' can be an answer for 'nestling' (I've seen this before). I'm not certain of the 'in the barn' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for owlet that I've seen before include "Towel (anag)" , "who'll give a hoot?" , "new hooter?" , "Little nocturnal bird" , "Small bird of prey from Africa and Asia" .)

I've seen this clue in The Guardian.

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